Some humor below – excerpts:

Kids Are Quick 
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TEACHER:   Maria, go to the map and find North America. 
MARIA:      Here it is. 
TEACHER:    Correct. Now class, who discovered America? 
CLASS:       Maria. 
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TEACHER:    John, why are you doing your math multiplication on the floor? 
JOHN:        You told me to do it without using tables. 
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TEACHER:    Glenn, how do you spell 'crocodile?' 
GLENN:       K-R-O-K-O-D-I-A-L' 
TEACHER:    No,that's wrong 
GLENN:       Maybe it is wrong, but you asked me how I spell it. 

(I Love this kid) 
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TEACHER:   Donald, what is the chemical formula for water? 
DONALD:    H I J K L M N O. 
TEACHER:   What are you talking about? 
DONALD:    Yesterday you said it's H to O. 
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TEACHER:   Winnie, name one important thing we have today that we didn't have ten years ago. 
WINNIE:    Me! 
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TEACHER:    Glen, why do you always get so dirty? 
GLEN:        Well, I'm a lot closer to the ground than you are. 
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TEACHER:    Millie, give me a sentence starting with ' I.' 
MILLIE:      I is.. 
TEACHER:    No, Millie..... Always say, 'I am.' 
MILLIE:      All right... 'I am the ninth letter of the alphabet.' 
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TEACHER:    George Washington not only chopped down his father's cherry tree, but also admitted it. Now, Louie, do you know why his father didn't punish him? 
LOUIS:       Because George still had the axe in his hand. 
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TEACHER:    Now, Simon, tell me frankly, do you say prayers before eating? 
SIMON:      No sir, I don't have to, my Mom is a good cook. 
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TEACHER: Clyde, your composition on 'My Dog' is exactly the same as your brother's. Did you copy his? 
CLYDE:     No, sir. It's the same dog. 
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TEACHER:  Harold, what do you call a person who keeps on talking when people are no longer interested? 
HAROLD:   A teacher